HTC Nexus One by Google (unlocked)

Design
Though sleek and attractive, the Nexus One's candy bar, touch-screen-only design doesn't break new design ground. With its trackball and prominent display, it looks a bit like both the HTC Hero and the HTC Droid Eris. At 4.56 inches by 2.36 inches by 0.47 inch, it's about the same size as the Droid Eris, the Hero, and the iPhone, but it weighs just 4.58 ounces The two-toned gray color scheme is standard smartphone, but the handset has a comfortable and very solid feel in the hand.
Not surprisingly, the Nexus One's star attraction is its 3.7-inch AMOLED display. Bursting with 16.7 million colors and an 800x480-pixel resolution, the display really is a wonder. Everything from standard text to busy photos and graphics jumped right off the display in full glory. The Android 2.1 operating system adds to the fun with 3D graphics (more on that later) and live wallpapers, which are animated backgrounds that react to your touch and your music. They're a nifty and attractive touch, but we realize they may be a bit much for some people and we're not sure if they affect battery life. Standard wallpapers are available if you're not game.

Features
As an Android phone, the Nexus One has everything you'd expect from the OS. The contacts menu is limited by the available memory, but each entry can store multiple fields for phone numbers, street addresses, work information, e-mails, URLs, instant-messaging handles, nicknames, and notes. Contacts are automatically synced from your Gmail account, and you can also sync Facebook and Microsoft Exchange contacts. We did both and the process took just seconds. As with previous Android phones, you must store applications from the Android Market on the 512MB of internal memory. MicroSD cards (the Nexus One comes with a 4GB card, but it can accommodate cards up to 32GB) are only for other data files.
Besides Gmail, the Nexus One also supports additional POP3 and IMAP4 accounts, though not through a unified in-box. We added an Outlook Web Access (OWA) CNET e-mail, but so far we've been unable to add a Yahoo Mail account. When we tried doing so, we received a message that not all Yahoo accounts are supported. That's the first time we've seen that on an Android phone, or any smartphone for that matter, and it's troubling. When we typed in our Yahoo account anyway, the Nexus One informed us that our username and password were incorrect (we did it several times to be sure).

Performance
We tested the Nexus One in Las Vegas with T-Mobile service. As a quad-band world phone (GSM 850/900/1800/1900), you'll be able to use the Nexus One with any GSM carrier, but its 3G bands (2100/AWS/900) are compatible only with T-Mobile's network in the United States. AT&T customers will be able to use the Nexus One, but their data speeds will top out at EDGE. We'd also love to see a dual-mode phone that supports both CDMA and GSM networks.
Call quality was quite good on the whole. Conversations were clear, the volume was loud, and we heard little static or interference. Indeed, the noise cancellation feature seemed to work as we could hear clearly when we were in a crowded room. We even could get service at the Las Vegas Convention Center during the 2010 International CES. With thousands of cell phone-happy people in one place, CES can be a notorious dead zone.